<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        header{
            display: block;
            font-weight: bold;
        }
        p{
            width: 1em;
        }
    </style>
</head>
<body>
    <article contenteditable="false">
        <header>标题 <i>不可编辑</i></header>
        <p contenteditable="true">内容 <i>可编辑</i></p>
    </article>
</body>
</html>